Castle - Season 6 Episode 19

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    6x19 | The Greater Good

    March 25,2014, 03:00AM

    Castle and Beckett investigate the murder of a Wall Street trader, but the case takes a shocking turn when the they discover the victim was an undercover informant for the U.S. Attorney's office. To complicate matters further, the U.S. attorney involved is Elizabeth Weston, Captain Gates' estranged sister.